The CNC boring and milling machines produced by ALLES CNC are divided into ALBM series Worktable Moving Boring Milling Machine and ALBM series Gantry Moving Boring Milling Machine to provide customers with corresponding needs. As a major process of finishing, the boring process has a very high processing precision. After the fine boring, the dimensional accuracy can reach IT8~IT7, and the aperture precision can be controlled within 0.01MM. If it is a more precise boring process, its machining accuracy can even be achieved with IT6, and the surface quality is quite good. The surface roughness of ordinary pupils, that is, Ra, can be controlled at 1.6 to 0.8 μm.
Precautions for boring step and file installation
When performing the boring, the first thing to do is to install the boring tool. The quality of the boring tool is related to the quality of the boring. When installing the boring tool, it is necessary to pay special attention to whether the main blade plane of the boring tool is The feed direction is kept horizontal, and only when they are at the same level can the cutting angle to the cutting edge be correct.
When making the boring, the initial boring should adjust the machining feed according to the processing demand, and reserve 0.3~0.5mm fine balance. If it is boring and boring, adjust the boring allowance to 0.5mm according to the initial hole allowance. .
After the boring tool is installed, a test operation is required to verify that the installed boring tool can meet the requirements of fine and rough.
Before the boring processing, the tooling, the positioning reference of the workpiece, and the positioning components should be inspected to determine whether it is stable and reliable. At the same time, it is necessary to check whether the repeatability of the machine tool spindle, The dynamic balance accuracy, etc. can meet the processing requirements.
For horizontal boring, the dynamic runout value of the gravitational overhang of the mast must be checked during the test, and the problems appearing during the inspection are properly corrected to reduce the effects of centrifugal shear vibration.
For the pupil allowance, different machining allowances are reserved according to different machining precisions. For rough boring, the reserved margin is 0.5mm, and the semi-precision and fine boring can be reserved 0.15mm. Of course, the reserved margin is based on Adjust the situation at any time to avoid the poor precision effect caused by the excessive amount of the knife in the fine time.
For some special materials and difficult-to-machine materials, when the boring operation is performed, the precise process amount can be increased, and at the same time, when the boring is performed, the margin should be greater than 0.05 mm to prevent the processing surface from being elastic and allowing the knife phenomenon.
When performing the tool setting operation, the file should be carefully watched to prevent the working part of the file from colliding with the tool block, causing problems with the file, affecting the precision of the hole and destroying the quality of the product.
When performing boring, it is necessary to cool it at the same time, and at the same time, the machined part is lubricated to reduce the cutting resistance. At the same time, it is necessary to pay attention to whether the chip removal is smooth, so as to avoid the waste chips from being affected, and the scraps affect the machining accuracy and surface quality.
Main problems in boring
In the boring processing, due to the continuous machining of the tool, the tool tip loss is very easy to occur, and the tool loss has a great influence on the precision of the processed product, which easily leads to excessive surface roughness, and the deviation of the workpiece aperture leads to the product. The quality is unqualified.
The machining errors that occur after the boring process are usually reflected in some dimensional tolerances, geometrical tolerances, etc., and there are many factors that can cause these problems: such as excessive tool length to diameter ratio, overhanging, and material of the blade. Mismatch with workpiece material, unreasonable margin reserve, unreasonable boring feed, and excellent workpiece material.
Thread cutting or scaly cut on the surface of the workpiece after boring is often encountered, and the cut is mainly due to the tool feed and the speed mismatch, or the rigid vibration of the boring process. Caused by tool wear.
In the boring process, the measuring instrument used in the measurement process is improperly used and the measurement method is wrong, which is a common quality hazard in the boring process.
I hope this article can help new and existing customers of ALLES CNC.
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